CN217724457U

CN217724457U - Magnetic control adjustable water resistance rowing machine

Info

Publication number: CN217724457U
Application number: CN202221665326.2U
Authority: CN
Inventors: 王胤龙
Original assignee: Changlong Tianjin Intelligent Technology Co ltd
Current assignee: Changlong Tianjin Intelligent Technology Co ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-11-04
Anticipated expiration: 2032-06-29

Abstract

The utility model discloses a magnetic control adjustable water resistance rowing machine, which comprises a main frame; a water resistor assembled inside the main frame; a handle provided with a guide belt; the conduction band is connected with the propeller shaft and is used for driving the propeller shaft to rotate; the bottom of the paddle shaft extends into the water resistor and is provided with an impeller which generates water resistance when rotating; the magnetic resistance device comprises a metal shell, a fixing component and a magnet, wherein the fixing component and the magnet are arranged in the metal shell; the adjusting knob is used for adjusting the distance between the magnet and the metal shell; and the transmission device is connected with the paddle shaft and the metal shell and is used for driving the metal shell to rotate. The utility model installs the magnetic resistance device on the oar shaft of the original rowing machine, and the magnetic resistance generated by the rotation of the magnetic resistance device can be changed by the external adjusting device; the resistance is closely linked with the paddle shaft through a magnetic resistance device, so that the integral resistance is changed.

Description

Magnetic control adjustable water resistance rowing machine

Technical Field

The utility model relates to a body-building apparatus technical field, concretely relates to adjustable water resistance rowing machine of magnetic control.

Background

Rowing machines are machines used for training purposes to simulate the movement of water racing boats. The indoor rowing machine is also commonly called a dynamometer and is used for measuring the strength consumed by a sporter in motion, the rowing machine has a good effect on strengthening muscles of legs, waists, upper limbs, chests and backs, and the upper limbs, the lower limbs, the waists and the abdomens and the backs can complete one-time complete contraction and extension in the process every time of rowing, so that the aerobic exercise effect of whole muscles can be achieved.

The water resistance rowing machine in the current market is divided into two types, namely non-adjustable and adjustable, wherein the adjustable water resistance rowing machine has the following two prior arts:

1. a novel water resistance rowing machine with the patent number CN 201821571032.7; the paddle in the water resistor is designed to be opened and closed in a multilayer mode, a rotating button is arranged on a top plate of the rowing machine, the paddle is controlled to be opened and closed by taking the inside of a paddle shaft as a transmission rod through a gear structure, the purpose is to control the contact area of the paddle and water, and the maximum resistance of the contact area is the largest when the paddle is completely closed; when the paddle is opened, the contact area of the paddle and water is minimum, and the resistance is minimum;

adopt this kind of design though also have some resistance changes but the difference is little, can not satisfy customer's demand, when water begins to rotate through the paddle rotation in the water resistor, water mainly laminates the water resistor inner wall and rotates, and the paddle is in fact limited with the water contact surface, and the department that opens and shuts of paddle has many places to be can't contact the surface of water, so whole difference is little.

2. A magnetic water double-resistance rowing machine with a patent number CN 213760355U; the upper cover of the water resistor is provided with a rotary disc groove, the rotary disc groove is placed in a groove on the outer side of the upper cover of the water resistor, a magnet is arranged in a rotary disc, the rotary disc and blades of the water resistor are fixed on the same propeller shaft, a group of movable magnet channels are arranged on the side surface of the rotary disc groove, and the distance between an external magnet and the rotary disc is adjusted through an adjusting button to generate resistance;

the adoption of the adjusting mode has the disadvantages of reducing the volume of the water resistor, reducing the water resistance, having too small magnet contact surface and unobvious magnetic resistance, and being inconvenient for adjusting the size of the adjusting button at the lower part of the machine body frame.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an adjustable magnetic control adjustable water resistance rowing machine; the magnetic resistance can be adjusted, and the water resistance of the water resistor can not be reduced.

In order to solve the technical problem, the utility model provides an adjustable water resistance rowing machine of magnetic control, include:

a main frame;

the water resistor is assembled inside the head end of the main frame;

a handle provided with a guide belt; the conduction band is connected with the paddle shaft to drive the paddle shaft to rotate;

the bottom of the paddle shaft extends into the water resistor and is provided with an impeller which generates water resistance when rotating;

it is characterized in that the water resistance rowing machine with the adjustable magnetic control further comprises:

the auxiliary fixed shaft is fixedly arranged on the main frame;

the magnetic resistance device comprises a metal shell, a fixing component and a magnet, wherein the fixing component and the magnet are arranged in the metal shell;

the adjusting device is used for adjusting the distance between the magnet and the metal shell;

a transmission device connecting the paddle shaft and the metal housing;

wherein:

the metal shell is movably sleeved on the auxiliary fixed shaft;

the fixing component is fixedly arranged on the auxiliary fixed shaft;

the paddle shaft drives the metal shell to rotate outside the fixed component through a transmission device;

the magnet is assembled on the fixing component and is spaced from the metal shell by a certain distance; which is used to create magnetic resistance with the metal housing.

Preferably, the transmission comprises a first pulley, a second pulley and a belt;

the first rotating wheel is sleeved on the propeller shaft, the guide belt is connected with the first rotating wheel, and the guide belt drives the propeller shaft to rotate through the first rotating wheel;

the second rotating wheel is sleeved on the propeller shaft; for co-rotation with rotation of the paddle shaft;

and the belt is sleeved on the second rotating wheel and the metal shell and used for driving the second rotating wheel and the metal shell to rotate together.

Preferably, the center of the metal shell protrudes outwards to form a shell mounting ring, the belt is sleeved on the second rotating wheel and the shell mounting ring, and the diameter of the second rotating wheel is larger than that of the shell mounting ring.

Preferably, the guide belt is connected with the first rotating wheel after bypassing the guide belt wheel, and the guide belt wheel and the first rotating wheel are positioned on the same horizontal plane.

Preferably, the adjusting device comprises an adjusting switch, an adjusting turntable, a brake cable fixing tube and a brake cable;

the adjusting switch is electrically connected with a motor of the adjusting turntable and used for controlling the rotation of the adjusting turntable;

the head end of the brake cable is fixed on the adjusting turntable, and the tail end of the brake cable penetrates through the brake cable fixing pipe and then is fixedly connected with the fixing component;

and the adjusting turntable is used for pulling the fixing component to move through the brake cable so as to adjust the distance between the magnet and the metal shell.

Preferably, the fixing assembly comprises two bottom plates and a limiting member arranged between the two bottom plates; wherein, the two bottom plates are coaxially arranged from top to bottom in sequence;

the limiting piece comprises two arc-shaped limiting arc strips which are arranged at the position, close to the edge, of the bottom plate, and the two limiting arc strips are symmetrically arranged by taking the axis of the bottom plate as the center; the head end of the limiting arc strip is provided with a hinge column which is convex towards the upper side and the lower side;

the opposite side surfaces of the two bottom plates are provided with embedded columns and hinge grooves;

the embedded columns are used for fixing the two bottom plates into a whole; the hinge column of the limiting arc strip is inserted into the hinge groove, so that the limiting arc strip is hinged on the bottom plate.

Preferably, the bottom plate has seted up the holding tank in the position that is close to its center, installs the tube head at the tail end of the fixed pipe of brake cable, and the tube head is fixed to be set up on the holding tank.

Preferably, a linkage piece is arranged between the two limiting arc bars;

the position of the limiting arc strip close to the tail end of the limiting arc strip is provided with a limiting hole along the length direction of the limiting arc strip;

the linkage piece is hinged at the central position of the bottom plate, and two ends of the linkage piece respectively penetrate through the limiting holes of the two limiting arc strips.

Preferably, the magnetic control adjustable water resistance rowing machine further comprises an elastic device;

one end of the elastic device is fixedly connected with the tail end of one limiting arc strip, and the other end of the elastic device is fixedly connected with the head end of the other limiting arc strip.

Preferably, the tail end of the limiting arc strip is bent outwards to form a blocking part, and the blocking part is used for limiting the minimum distance between the magnet and the metal shell.

Compared with the prior art, the beneficial effects of the utility model are that:

the magnetic resistance device is arranged on the paddle shaft of the original rowing machine and is tightly connected with the paddle shaft, and the magnetic resistance generated by the rotation of the magnetic resistance device can be changed through an external adjusting device, so that the overall resistance of the rowing machine is changed.

The magnetic resistance device is not installed in the water resistor, but installed on the frame, so that the water resistance of the water resistor cannot be reduced; the subsequent installation and disassembly of the reluctance device are also more convenient;

the utility model discloses increased transmission, the oar axle passes through transmission and drives the magneto resistive device and rotate, compares in the direct mode that drives the magneto resistive device of oar axle, the utility model discloses the size of regulation magnetic resistance that can be more easy.

Drawings

FIG. 1 is a schematic structural view of the utility model of a magnetically controlled adjustable water resistance rowing machine;

FIG. 2 is a schematic view of the internal structure of the fixing assembly;

FIG. 3 is a schematic view of a stopper assembled between two base plates;

FIG. 4 is a schematic view of the structure of the adjustment device;

fig. 5 is a schematic view of the structure of the transmission.

In the drawings, the correspondence between each component and the reference numeral is:

1. a main frame; 2. a water resistor; 3. a handle; 4. a paddle shaft; 5. a magneto-resistive device; 501. a metal housing; 502. a fixing assembly; 503. a magnet; 501. a metal housing; 5011. a housing mounting ring; 5021. a base plate; 5022. a limiting member; 50221. limiting arc strips; 50222. a hinged column; 50223. a blocking portion; 50211. a fitting column; 50212. a hinge slot; 5023. a linkage member; 50211. a boss portion; 6. an adjustment device; 601. an adjustment switch; 602. adjusting the turntable; 603. a brake cable fixing tube; 604. a brake cable; 7. an elastic device; 8. a transmission device; 801. a first runner; 802. a second runner; 803. a belt; 9. a guide pulley; 10. and (5) auxiliary shaft fixing.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The invention is described in further detail below with reference to the accompanying figures 1-5:

the utility model provides a pair of adjustable water resistance rowing machine of magnetic control, include:

a main frame 1;

a water resistor 2 assembled inside the head end of the main frame 1;

a handle 3 provided with a guide belt 31; the conduction band 31 is connected with the propeller shaft 4 to drive the propeller shaft 4 to rotate;

a paddle shaft 4, the bottom of which extends into the water resistor 2 and is provided with an impeller generating water resistance when rotating;

an auxiliary dead axle 10 fixedly provided on the main frame 1;

a magnetic resistance device 5 including a metal case 501, a fixed member 502 disposed inside the metal case 501, and a magnet 503;

an adjusting device 6 for adjusting the distance between the magnet 503 and the metal housing 501;

a transmission 8 connecting the paddle shaft 4 and the metal housing 501;

wherein:

the metal shell 501 is movably sleeved on the auxiliary fixed shaft 10;

the fixing component 502 is fixedly arranged on the auxiliary dead axle 10;

the paddle shaft 4 drives the metal shell 501 to rotate outside the fixing component 502 through the transmission device 8;

the magnet 503 is assembled on the fixing component 502 and is spaced from the metal shell 501 by a certain distance; it is used to generate magnetic resistance with the metal housing 501;

in this embodiment, the magnet 503 and the side wall of the metal housing 501 generate magnetic resistance, and the distance between the magnet 503 and the side wall is large, so that the magnetic resistance is small, otherwise, the magnetic resistance is large; the magnetic resistance is adjusted by adjusting the distance between the magnet 503 and the metal shell 501.

In a preferred embodiment, the transmission 8 comprises a first wheel 801, a second wheel 802 and a belt 803;

the first rotating wheel 801 is sleeved on the paddle shaft 4, the guide belt 31 is connected with the first rotating wheel 801, and the guide belt 31 drives the paddle shaft 4 to rotate through the first rotating wheel 801;

the second rotating wheel 802 is sleeved on the propeller shaft 4; for co-rotation with the rotation of the propeller shaft 4;

the belt 803 is sleeved on the second wheel 802 and the metal shell 501, and is used for driving the second wheel 802 and the metal shell 501 to rotate together.

In this embodiment, the first runner 801 and the second runner 802 may employ a one-way bearing; when in use, the metal shell 501 is sleeved on the auxiliary dead axle 10, but the two are not contacted; the guide belt 31 drives the metal shell 501 to rotate through the first rotating wheel 801, the paddle shaft 4 and the second rotating wheel 802 in sequence, so that the metal shell 501 rotates outside the fixed component 502.

In a preferred embodiment, the central position of the metal housing 501 protrudes outward to form a housing mounting ring 5011, the belt 803 is sleeved on the second runner 802 and the housing mounting ring 5011, and the diameter of the second runner 802 is larger than that of the housing mounting ring 5011;

in this embodiment, when the paddle shaft 4 is rotated by the belt 31, the speed of the belt 31 can be increased by the second runner 802 and the housing mounting ring 5011 with different diameters, so that the rotation speed of the metal housing 501 is greater than that of the paddle shaft 4, thereby increasing the magnetic resistance between the metal housing 501 and the magnet 503 under the same pulling force.

In a preferred embodiment, the guide belt 31 is connected with the first rotating wheel 801 after passing through the guide pulley 9, and the guide pulley 9 and the first rotating wheel 801 are located on the same horizontal plane;

in the present embodiment, the guide pulley 9 can restrict the position of the guide belt 31 such that the guide belt 31 horizontally extends toward the first pulley 801.

In a preferred embodiment, the adjusting device 6 comprises an adjusting switch 601, an adjusting turntable 602, a brake cable fixing tube 603 and a brake cable 604;

the adjusting switch 601 is electrically connected with the adjusting turntable 602 and is used for controlling the rotation of the adjusting turntable 602; the adjusting switch 601 is arranged at the position adjacent to the handle 3;

the head end of the brake cable 604 is fixed on the adjusting turntable 602, and the tail end thereof passes through the brake cable fixing pipe 603 and then is fixedly connected with the fixing component 502;

the adjusting dial 602 is used for pulling the fixing component 502 to move through the brake cable 604, so as to adjust the distance between the magnet 503 and the metal shell 501.

In a preferred embodiment, the fixing assembly 502 includes two bottom plates 5021 and a stopper 5022 fitted between the two bottom plates 5021; the two bottom plates 5021 are coaxially arranged from top to bottom in sequence, and the auxiliary fixed shaft 10 penetrates through the axial center positions of the two bottom plates 5021 and is fixed;

the limiting piece 5022 comprises two arc-shaped limiting arc strips 50221 which are arranged at the position, close to the edge, of the bottom plate 5021, and the two limiting arc strips 50221 are symmetrically arranged by taking the axis of the bottom plate 5021 as the center; the head end of the limit arc 50221 is provided with a hinge column 50222 protruding towards the upper side and the lower side;

the opposite side faces of the two bottom plates 5021 are provided with an embedded column 50211 and a hinge groove 50212; and the bottom plate 5021 positioned above is fixedly connected with the main frame 1;

the embedded column 50211 is used for fixing the two bottom plates 5021 into a whole; the hinge post 50222 of the limit arc 50221 is inserted into the hinge slot 50212 to hinge the limit arc 50221 to the bottom plate 5021,

in a preferred embodiment, a containing groove 50213 is formed in the bottom plate 5021 near the center, a tube head 6031 is mounted at the tail end of the brake cable fixing tube 603, and the tube head 6031 is fixedly arranged on the containing groove 50213;

in this embodiment, this ensures that the brake cable 604 is positioned on the inner side of the limit arc 50221, and the brake cable 604 pulls the limit arc 50221 to move towards the inner side.

In a preferred embodiment, the number of the hinge slots 50212 on each bottom plate 5021 is the same as the number of the limit arc strips 50221, and the two hinge slots 50212 are symmetrically arranged on the bottom plate 5021;

a linkage piece 5023 is also arranged between the two limit arc strips 50221;

the limiting arc strips 50221 are provided with limiting holes 50224 along the length direction at the positions close to the tail ends of the limiting arc strips 5363, and the limiting holes 50224 are long strips;

the link 5023 is hinged to the center of the bottom plate 5021, two ends of the link 5023 respectively penetrate through the limiting holes 50224 of the two limiting arc strips 50221, and the link 5023 can simultaneously drive the tail ends of the two limiting arc strips 50221 to rotate towards the inner side.

When the brake cable 604 drives the tail end of the limit arc 50221 to rotate inward, the distance between the magnet 503 and the metal shell 501 is gradually increased.

In this embodiment, the link 5023 is rotated on the bottom plate 5021, such that the link 5023 pushes the inner sidewall of the arc-shaped spacing bar 50221, and the arc-shaped spacing bar 50221 rotates with the head end as the axis and the tail end toward the inner side.

The tail end of the brake cable 604 is fixedly connected with the tail end of one of the limit arc strips 50221 of the fixed component 502, the brake cable 604 pulls the limit arc strip 50221 to move, and then the linkage 5023 drives the other limit arc strip 50221 to move.

In a preferred embodiment, two elastic means 7 are also included;

both elastic means 7 are: one end of the arc-shaped limiting strip 50221 is fixedly connected with the tail end of one of the arc-shaped limiting strips 50221, and the other end of the arc-shaped limiting strip 50221 is fixedly connected with the head end of the other arc-shaped limiting strip 50221.

When the tail ends of the limit arcs 50221 move inwards, the tail end of one limit arc 50221 and the tail end of the other limit arc 50221 gradually approach each other, so that the elastic device 7 is compressed; the elastic device 7 can make the tail end of the limit arc 5022 move outwards, and the elastic force of the elastic device 7 is used for restoring the position of the limit arc 50221;

in a preferred embodiment, the magnet 503 is held by two bottom plates 5021.

In a preferred embodiment, the tail end of the limit arc 50221 is bent outwards to form a stop 50223, and the stop 50223 can limit the minimum distance between the magnet 503 and the metal shell 501;

in the stationary state, the stopper 50223 abuts against the metal case 501, and at this time, the distance between the magnet 503 and the metal case 501 becomes minimum.

In a preferred embodiment, the metal housing 501 has a concave shape, the metal housing 501 covers the fixing member 502 and the magnet 503, and the metal housing 501 does not contact the auxiliary dead axle 10.

In this embodiment, the metal housing 501 is upside down, and covers the fixing member 502 and the magnet 503 from top to bottom.

In a preferred embodiment, the magnet 503 is disposed on the outer surface of the limit arc 50221, and the two are fixed by adhesive.

The utility model discloses the theory of operation does:

the user pulls the handle 3, and the conduction band 31 drives the propeller shaft 4 to rotate through the first rotating wheel 80; then the second rotating wheel 802 on the paddle shaft 4 passes through the belt 803 to drive the metal shell 501 to rotate together outside the fixing component 502; the magnet 503 and the side wall of the rotating metal shell 501 generate magnetic resistance;

the adjusting turntable 602 is controlled to rotate by the adjusting switch 601, so that the brake cable 604 is pulled, the brake cable 604 drives one of the limiting arc strips 50221 in the fixed assembly 502 to move, and then the other limiting arc strip 50221 is driven by the linkage 5023 to move together;

when the brake cable 604 drives the tail end of the limit arc strip 50221 to gradually rotate inwards, the distance between the magnet 503 on the limit arc strip 50221 and the metal shell 501 gradually increases; conversely, the distance between the magnet 503 and the metal housing 501 gradually decreases. The larger the distance between the two is, the smaller the magnetic resistance is, otherwise, the larger the magnetic resistance is; the magnetic resistance is adjusted by adjusting the distance between the magnet 503 and the metal shell 501.

The above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or replacements within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be defined by the claims.

Claims

1. A magnetically controlled adjustable water drag rowing machine, comprising:

a main frame (1);

the water resistor (2) is assembled inside the head end of the main frame (1);

a handle (3) provided with a guide belt (31); the guide belt (31) is connected with the propeller shaft (4) and is used for driving the propeller shaft (4) to rotate;

the bottom of the paddle shaft (4) extends into the water resistor (2) and is provided with an impeller which generates water resistance when rotating;

an auxiliary fixed shaft (10) fixedly arranged on the main frame (1);

a magnetoresistive device (5) comprising a metal housing (501), a fixed component (502) and a magnet (503) arranged within the metal housing (501);

an adjusting device (6) for adjusting the distance between the magnet (503) and the metal shell (501);

a transmission (8) connecting the paddle shaft (4) and the metal housing (501);

wherein:

the metal shell (501) is movably sleeved on the auxiliary fixed shaft (10);

the fixed component (502) is fixedly arranged on the auxiliary fixed shaft (10);

the paddle shaft (4) drives the metal shell (501) to rotate outside the fixed component (502) through the transmission device (8);

the magnet (503) is assembled on the fixing component (502) and is spaced from the metal shell (501) by a certain distance; which is used to create a resistance with the rotating metal housing (501).

2. The magnetically controlled adjustable water resistance rowing machine of claim 1, further comprising:

the transmission device (8) comprises a first rotating wheel (801), a second rotating wheel (802) and a belt (803);

the first rotating wheel (801) is sleeved on the propeller shaft (4), the guide belt (31) is connected with the first rotating wheel (801), and the guide belt (31) drives the propeller shaft (4) to rotate through the first rotating wheel (801);

the second rotating wheel (802) is sleeved on the propeller shaft (4); for co-rotation with the rotation of the propeller shaft (4);

the belt (803) is sleeved on the second rotating wheel (802) and the metal shell (501) and is used for driving the second rotating wheel (802) and the metal shell (501) to rotate together.

3. The magnetically controlled adjustable water resistance rowing machine of claim 2, further comprising:

the center of the metal shell (501) protrudes outwards to form a shell mounting ring (5011), the belt (803) is sleeved on the second runner (802) and the shell mounting ring (5011), and the diameter of the second runner (802) is larger than that of the shell mounting ring (5011).

4. The magnetically controlled adjustable water resistance rowing machine of claim 1, further comprising:

the guide belt (31) is connected with the first rotating wheel (801) after bypassing the guide belt wheel (9), and the guide belt wheel (9) and the first rotating wheel (801) are located on the same horizontal plane.

5. The magnetically controlled adjustable water resistance rowing machine of claim 1, further comprising:

the adjusting device (6) comprises an adjusting switch (601), an adjusting rotary table (602), a brake cable fixing tube (603) and a brake cable (604);

the adjusting switch (601) is electrically connected with a motor of the adjusting turntable (602) and is used for controlling the rotation of the adjusting turntable (602);

the head end of the brake cable (604) is fixed on the adjusting turntable (602), and the tail end of the brake cable passes through the brake cable fixing pipe (603) and then is fixedly connected with the fixing component (502);

the adjusting turntable (602) is used for pulling the fixing component (502) to move through a brake cable (604), so that the distance between the magnet (503) and the metal shell (501) is adjusted.

6. The magnetically controlled adjustable water resistance rowing machine of claim 5, further comprising:

the fixing assembly (502) comprises two bottom plates (5021) and a limiting piece (5022) arranged between the two bottom plates (5021); wherein, the two bottom plates (5021) are coaxially arranged from top to bottom in sequence;

the limiting piece (5022) comprises two arc-shaped limiting arc strips (50221) which are arranged at the position, close to the edge, of the bottom plate (5021), and the two limiting arc strips (50221) are symmetrically arranged by taking the axis of the bottom plate (5021) as the center; the head end of the limit arc bar (50221) is provided with a hinge column (50222) which is convex towards the upper side and the lower side;

one opposite side surfaces of the two bottom plates (5021) are provided with embedded columns (50211) and hinged grooves (50212);

the embedded columns (50211) are used for fixing the two bottom plates (5021) into a whole; a hinge column (50222) of the limit arc bar (50221) is inserted into the hinge groove (50212), so that the limit arc bar (50221) is hinged on the bottom plate (5021).

7. The magnetically controlled adjustable water resistance rowing machine of claim 6, further comprising:

holding tank (50213) have been seted up in bottom plate (5021) near its central position, and tube head (6031) are installed to the tail end at brake line fixed tube (603), and tube head (6031) are fixed to be set up on holding tank (50213).

8. The magnetically controlled adjustable water resistance rowing machine of claim 7, wherein:

a linkage piece (5023) is arranged between the two limit arc strips (50221);

the position of the limit arc bar (50221) close to the tail end of the limit arc bar is provided with a limit hole (50224) along the length direction of the limit arc bar;

the linkage piece (5023) is hinged to the center of the bottom plate (5021), and two ends of the linkage piece respectively penetrate through the limiting holes (50224) of the two limiting arc strips (50221).

9. The magnetically controlled adjustable water resistance rowing machine of claim 8, further comprising:

the magnetic control adjustable water resistance rowing machine also comprises an elastic device (7);

one end of the elastic device (7) is fixedly connected with the tail end of one of the limiting arc strips (50221), and the other end of the elastic device (7) is fixedly connected with the head end of the other limiting arc strip (50221).

10. The magnetically controlled adjustable water resistance rowing machine of claim 9, wherein:

the tail end of the limit arc strip (50221) is bent outwards to form a blocking part (50223), and the blocking part (50223) is used for limiting the minimum distance between the magnet (503) and the metal shell (501).